Drying model of a high salt content cementitious waste form: Effect of capillary forces and salt solution

Highlights: • Drying model for a high salt content cementitious waste form is developed. • Water vapor diffusion and capillary liquid flow are distinguished. • Capillary and salt solution effects are considered in vapor-liquid equilibrium. A water transport model coupling capillary liquid flow with...

Full description

Saved in:
Bibliographic Details
Published inCement and concrete research Vol. 146
Main Authors Zhang, Peng, Chen, Zhiliang, Brown, Kevin G., Meeussen, Johannes C.L., Gruber, Chen, Garrabrants, Andrew C., Kosson, David S.
Format Journal Article
LanguageEnglish
Published United States 15.08.2021
Subjects
CAPILLARIES
COUPLING
DIFFUSION
DISTRIBUTION
HUMIDITY
LIQUID FLOW
LIQUIDS
MATERIALS SCIENCE
SIMULATION
SURFACE TENSION
THERMODYNAMIC ACTIVITY
THERMODYNAMICS
TRANSPORT THEORY
WASTE FORMS
WATER SATURATION
WATER VAPOR
Online AccessGet full text

Cover

More Information
Summary:Highlights: • Drying model for a high salt content cementitious waste form is developed. • Water vapor diffusion and capillary liquid flow are distinguished. • Capillary and salt solution effects are considered in vapor-liquid equilibrium. A water transport model coupling capillary liquid flow with vapor diffusion is developed to describe the drying process for a cementitious waste form with high salinity porewater. Vapor-liquid equilibrium is formulated as the driving force for vapor diffusion and the model accounts for pore capillary and high salinity effects on water thermodynamic activity. Pore filling and porewater surface tension as a function of pore size distribution and water saturation have been quantified for the material. Geochemical speciation modeling is used to simulate porewater activity as a function of composition over the range of saturation. The theoretical relationship between relative humidity and water saturation generally agrees with experimental measurement, and the developed model is capable of predicting drying rates under various external relative humidity conditions. The model was developed to be incorporated into reactive transport models considering the effects of drying such as salt redistribution and efflorescence.
ISSN:0008-8846
DOI:10.1016/J.CEMCONRES.2021.106459